A USB flash drive is a compact device that you may use to preserve digital data by plugging it into your laptop, camera, or phone. Flash drives are compact and light, they may be attached to lanyards or keychains, making them convenient to carry with you. A USB flash drive has storage capacity ranging from 2GB to 128GB. Flash drives are both compact and extremely powerful. When you insert a USB flash drive into a USB port, the operating system detects the connection. They are operate using an electronic flash memory, which saves data in blocks and rewrites it as bytes.